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Detectionhightest

Invoke-Obfuscation Via Use Rundll32 - Security

Detects Obfuscated Powershell via use Rundll32 in Scripts

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Launch
Nikita Nazarov, oscd.communityCreated Fri Oct 09Updated Tue Nov 29cd0f7229-d16f-42de-8fe3-fba365fbcb3awindows
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security

Definition

The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697

Detection Logic
Detection Logic1 selector
detection:
    selection:
        EventID: 4697
        ServiceFileName|contains|all:
            - '&&'
            - 'rundll32'
            - 'shell32.dll'
            - 'shellexec_rundll'
        ServiceFileName|contains:
            - value
            - invoke
            - comspec
            - iex
    condition: selection
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
github.com
MITRE ATT&CK
Related Rules
DerivedDetectionhigh

Invoke-Obfuscation Via Use Rundll32 - System

Detects Obfuscated Powershell via use Rundll32 in Scripts

This rule was derived from the related rule - both detect similar activity with different scope.

Rule Metadata
Rule ID
cd0f7229-d16f-42de-8fe3-fba365fbcb3a
Status
test
Level
high
Type
Detection
Created
Fri Oct 09
Modified
Tue Nov 29
Author
Nikita Nazarov, oscd.community
Path
rules/windows/builtin/security/win_security_invoke_obfuscation_via_use_rundll32_services_security.yml
Raw Tags
attack.defense-evasionattack.t1027attack.executionattack.t1059.001
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